Injecting an NSHTTPCookieStorage dependency into CookieStoreIOS

ios/net/cookies/cookie_store_ios.h

Index: ios/net/cookies/cookie_store_ios.h
diff --git a/ios/net/cookies/cookie_store_ios.h b/ios/net/cookies/cookie_store_ios.h
index ad56bb511a34a27687e19274414726082a23189a..2a4bfbe58600ee9568ca279060ffaeb5d50cc643 100644
--- a/ios/net/cookies/cookie_store_ios.h
+++ b/ios/net/cookies/cookie_store_ios.h
@@ -22,9 +22,11 @@
 
 #if defined(__OBJC__)
 @class NSHTTPCookie;
+@class NSHTTPCookieStorage;
 @class NSArray;
 #else
 class NSHTTPCookie;
+class NSHTTPCookieStorage;
 class NSArray;
 #endif
 
@@ -64,20 +66,26 @@ class CookieNotificationObserver {
 class CookieStoreIOS : public net::CookieStore,
                        public CookieNotificationObserver {
  public:
+  // Creates a CookieStoreIOS with a default value of
+  // |NSHTTPCookieStorage sharedCookieStorage| as the system's cookie store.
   explicit CookieStoreIOS(
       net::CookieMonster::PersistentCookieStore* persistent_store);
 
+  explicit CookieStoreIOS(
+      net::CookieMonster::PersistentCookieStore* persistent_store,
+      NSHTTPCookieStorage* system_store);
+
   enum CookiePolicy { ALLOW, BLOCK };
 
   // Must be called on the thread where CookieStoreIOS instances live.
   static void SetCookiePolicy(CookiePolicy setting);
 
   // Create an instance of CookieStoreIOS that is generated from the cookies
-  // stored in the system NSHTTPCookieStorage. The caller is responsible for
-  // deleting the cookie store.
-  // Apple does not persist the cookies' creation dates in the system store,
+  // stored in |cookie_storage|. The CookieStoreIOS uses the |cookie_storage|
+  // as its default backend.
+  // Apple does not persist the cookies' creation dates in NSHTTPCookieStorage,
   // so callers should not expect these values to be populated.
-  static CookieStoreIOS* CreateCookieStoreFromNSHTTPCookieStorage();
+  static CookieStoreIOS* CreateCookieStore(NSHTTPCookieStorage* cookie_storage);
 
   // As there is only one system store, only one CookieStoreIOS at a time may
   // be synchronized with it.
@@ -175,6 +183,7 @@ class CookieStoreIOS : public net::CookieStore,
                                const DeleteCallback& callback);
 
   scoped_refptr<net::CookieMonster> cookie_monster_;
+  NSHTTPCookieStorage* system_store_;
   scoped_ptr<CookieCreationTimeManager> creation_time_manager_;
   bool metrics_enabled_;
   base::TimeDelta flush_delay_;